Device for bending pipe



E. O. DANIELS.

DEVIOE FOR BENDING PIPE.

Patented Apr. 19, 1887.

IJV'V'EJVTUR yer-:4 67 2472222:

Attorneys (No Model.)

, 'i -JNI'IEIJ STATES PATENT O FICE.

EUGENE ORA DANIELS, OF SPRINGFIELD, OHIO:

DEVICE FOR BENDINGPIPE.

SPECIFICATION forming part of Letters Patent No. 361,398, dated April 19, 1887. Application filed January 10, 1887. Serial No. 323,898. (No model.)

To all whom it may concern:

. Be it known that I, EUGENE ORA DANIELS, a citizen of the United -'S tates, residing at Springfield, in the county of Clark and State of Ohio, haveinventedcertain newand useful Improvements in Pipe'Bending Tools, of which the following is. specification, reference being had thereinktr the accompanying drawnns.

This invention in ates to improvements in tools for bending pip-asinto segmental curvatures-ofmore'or less length, orinto complete circles.

My invention consists, essentially, of a bar constituting a pipe-formerhaving a groove in one side and carved in oneend, and-aclamp to clamp the pipe, and of a lever pivoted to it and carrying a roller which has a groove agreeing.incross-section with the shape of the groove in the bar, and which travels upon the curved portion of the bar when the lever is actuated. V

' My invention further consists in makingthe groove in the bar and the groovein the roller, when the bar and roller are brought together or in juxtaposition, form an ellipse, so that around pipe when placed between the bar and the roller shall have a slight space along the innerand outer peripheries, while it will touch the grooves at the sides, the peculiar advantages of which will be hereinafter made to appear. It should, however, be also noted atthis point that I bend thepipes without resorting to the usual method of first filling the same with some material to prevent the pipe from collapsing while'bcing bent, and which is afterward removed from the pipe, as by being melted, ifthe fillingis ot a nature capable of being made to run by the application of heat. This operation of filling and unfilling has been long practiced, but is so expensive as to render it impracticable in certain artsns in the art of manufacturing tubular lightning-rods,in which numerous and greatlyvarying bonds are necessary 'to round the caves and cornices of differcntsizcs andshapes upon the various buildings. however, as I have learned by actual usage, overcomes this old difiicnlty, and renders the proper bending of the pipes practical and comparativelyinexpensive, and without fillmg.

My invention,

pipe-bending'tool with a pipe undergoing operation; Fig. 2, a partialplan and partial sectional view of the same without a pipe; Fig. 3, an enlarged sectional view 01' a portion of tool, showing more plainly the elliptical contour of the parts which receive and bend the pipe, and pipe therein; Fig. 4, a like view showing a circular contour to snclrparts, and Fig. 5 a detail sectional view of the clamping device.

The letter A refers to what I shall term the receiving "and forming part of the tool, and this consists of a metallic bar, 13, curved at G into a segment of any desired length or number of degrees, and having a groove, D, in one face thereof, which forms a seat for the pipe and av former by which its curvature is determined. Thercrosssection contour of this groove is made semi-elliptical or semicircular, the former preferred. .The reason of this preference is that the spaces between thepipe and the seat and engagingsurface at a b allow the metal of the pipe, when severely pressed at the points 0 d, to spread or expand radially toward the points a Z), and thus prevent the flattening of the pipe during the operation of bending it. To prevent this ilattening has been an end always in View in bending pipes, and has for a long .time proved a-source of trouble; hence the usual filling already alluded to. Another advantage of allowing the expansion alluded to is that it prevents the breaking or cracking of the pipe during the bending operation, as the pressure on the pipe at the points 0 (Z and the freedom to expand toward a b compensate for the distortion the molecules of the metal undergo.

From the bar 13 extend twd arms, 0, which form a fulcrum-support for the other part of the tool. From the bar also project lugs D and E, to which latter is pivoted a clampingplate, F, having a. recess to receive the pipe, and held to the other lug by a bolt and nut, GJ By this means the pipe'is secured firmly to the bar B,-which is necessary. Of course other forms of fastening devices may be employed. The letter H refers to the movable part of the tool, the sameconsisting ofa lever pivoted at I, and thence bifurcated or slotted, as seen in Fig. 2, and provided with an antifriction pipe engaging roller J. This rolleris provided with a peripheral groove whosecrossseclion contour is, as already suggested, preferably elliptical, for the purpose also here iirhefore mentioned. The position of the roller.

J on the lever is such that it travels smoothly on the segmental section of the bar B, while the bar and roller are constructed so as to engage each other to prevent lateral displace inches, while the segment may extend-through forty-five degrees or more, the more including onehundred and eighty degrees, or acomplete circle,'if desired. ,With a mere segment of forty-five degrees, however, I can bend a pipe into a circle by projecting it farther and farther through the segment as each section is bent. I can also vary the degrees of the angle in the'pipe even with the same segment by running the roller more or less around the segment, thus securing an obtuse, a right, or an acute angle, as may be needed; This is useful in shapinga section of lightning; rod pipe to extend rounda building-cornice.

My improved tool, it will be noted, is useful.

as well as a roof-tool, to be usedin' putting up tubular lightning-rods, as a shop-tool, to be used in manufacturing devices and implements and apparatus in which bent pipes are needed.

Having thus fully described my invention, what I claimas'new, and desire to secure by Letters'Patent, is-

1. In a pipe-bending tool, the combination, with a former having a pipeseat whose cross section is semi-elliptical,and aportion whereof forms the areof a circle, of a roller having a pipe-engaging groove whose. cross-section is also semi-elliptical, and which registers with the arc portion, and 'a lever carrying the roller an'dmounted to move it concentrically with that are and cause it to engage and bend the pl e! 2 In a pipe-bending tool, the combination, with a bar curved atone end and having lugs, a pivoted clamping-plate, and bolt and arms which form a fulcrum-support, and a groove in-o'ne face thereof semii'elliptical in cross-section,-o 'a lever'pivoted in said fulcrum-support and slotted-at its shorter end and an anti-friction roller mounted in said slot and against said arc and' having a groove semielliptical incross-se'ction.

s. In a pipe-bending'tooL-the combination, with a barcurved at one-end'and having lugs, a pivoted clam ping-plate and bolt, warms-which form a fulcrum-support, and 1a groove in one face-thereof, of a. lever pivoted in said ful; cram-support and-slotted at its shorter end and an anti friction roller mounted in said slot and against'said are and having a groove; in its periphery 4. In a pipe-bending-tool, afornie'r having a groove semi-elliptical in cross-section.

n testimony. whereof I affix my signature iii presence of two witnesses.

EUGENE ORA DANIELS.

\Vitn'sses:

A. A. YEATMAN, Cruse. STEWART. 

